#include <iostream>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
using namespace std;
int ticket = 10000;
pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;   
void* routine(void* args) {
    char* id = (char*)args;
    while(1) {
        pthread_mutex_lock(&lock);
        if(ticket > 0) {
            usleep(1000);
            printf("%s sells ticket:%d\n", id, ticket);
            ticket--;
            pthread_mutex_unlock(&lock);
        }else {
            pthread_mutex_unlock(&lock);
            break;
        }
    }
    return nullptr;
}
int main() {
    pthread_t t1, t2, t3, t4;
    pthread_create(&t1, NULL, routine, (void*)"thread_1");
    pthread_create(&t2, NULL, routine, (void*)"thread_2");
    pthread_create(&t3, NULL, routine, (void*)"thread_3");
    pthread_create(&t4, NULL, routine, (void*)"thread_4");
    pthread_join(t1, NULL);
    pthread_join(t2, NULL);
    pthread_join(t3, NULL);
    pthread_join(t4, NULL);
    return 0;
}